P/2015 K5 (PANSTARRS)
| Parameter |
Value |
| Designation |
P/2015 K5 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-06-06T08:58:18.402240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:11Z |
| Obs used |
56 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-06-12.0000000 |
| e |
0.55395709 |
| q (au) |
2.986133 |
| a (au) |
6.694721 |
| i (deg) |
39.987279 |
| Ω (om, deg) |
134.269042 |
| ω (w, deg) |
105.994786 |
| M (ma, deg) |
0.320124 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.097 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.097 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.936 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
05:14:13.22 |
-12:31:28.0 |
HIP 24492 |
20.00 |
| 2026-02-03 12:00 |
05:14:08.11 |
-12:29:50.1 |
HIP 24492 |
21.99 |
| 2026-02-04 00:00 |
05:14:03.09 |
-12:28:11.6 |
HIP 24465 |
21.64 |
| 2026-02-04 12:00 |
05:13:58.17 |
-12:26:32.6 |
HIP 24465 |
21.34 |
| 2026-02-05 00:00 |
05:13:53.35 |
-12:24:53.1 |
HIP 24259 |
21.17 |
| 2026-02-05 12:00 |
05:13:48.63 |
-12:23:13.1 |
HIP 24259 |
20.12 |
| 2026-02-06 00:00 |
05:13:44.00 |
-12:21:32.6 |
HIP 24259 |
19.24 |
| 2026-02-06 12:00 |
05:13:39.48 |
-12:19:51.6 |
HIP 24259 |
18.57 |
| 2026-02-07 00:00 |
05:13:35.05 |
-12:18:10.2 |
HIP 24259 |
18.12 |
| 2026-02-07 12:00 |
05:13:30.73 |
-12:16:28.2 |
HIP 24259 |
17.92 |
| 2026-02-08 00:00 |
05:13:26.50 |
-12:14:45.8 |
HIP 24259 |
17.96 |
| 2026-02-08 12:00 |
05:13:22.38 |
-12:13:03.0 |
HIP 24259 |
18.25 |
| 2026-02-09 00:00 |
05:13:18.35 |
-12:11:19.6 |
HIP 24259 |
18.76 |
| 2026-02-09 12:00 |
05:13:14.43 |
-12:09:35.9 |
HIP 24259 |
19.48 |
| 2026-02-10 00:00 |
05:13:10.61 |
-12:07:51.7 |
HIP 24244 |
20.33 |
| 2026-02-10 12:00 |
05:13:06.89 |
-12:06:07.1 |
HIP 24244 |
18.41 |
| 2026-02-11 00:00 |
05:13:03.28 |
-12:04:22.1 |
HIP 24244 |
16.51 |
| 2026-02-11 12:00 |
05:12:59.77 |
-12:02:36.7 |
HIP 24244 |
14.64 |
| 2026-02-12 00:00 |
05:12:56.36 |
-12:00:50.9 |
HIP 24244 |
12.81 |
| 2026-02-12 12:00 |
05:12:53.05 |
-11:59:04.7 |
HIP 24244 |
11.05 |
| 2026-02-13 00:00 |
05:12:49.85 |
-11:57:18.1 |
HIP 24244 |
9.36 |
| 2026-02-13 12:00 |
05:12:46.75 |
-11:55:31.2 |
HIP 24244 |
7.82 |
| 2026-02-14 00:00 |
05:12:43.75 |
-11:53:43.8 |
HIP 24244 |
6.52 |
| 2026-02-14 12:00 |
05:12:40.86 |
-11:51:56.2 |
HIP 24244 |
5.63 |
| 2026-02-15 00:00 |
05:12:38.08 |
-11:50:08.2 |
HIP 24244 |
5.33 |
| 2026-02-15 12:00 |
05:12:35.40 |
-11:48:19.8 |
HIP 24240 |
4.65 |
| 2026-02-16 00:00 |
05:12:32.82 |
-11:46:31.2 |
HIP 24240 |
4.35 |
| 2026-02-16 12:00 |
05:12:30.35 |
-11:44:42.2 |
HIP 24240 |
4.87 |
| 2026-02-17 00:00 |
05:12:27.99 |
-11:42:52.9 |
HIP 24240 |
6.01 |
| 2026-02-17 12:00 |
05:12:25.73 |
-11:41:03.3 |
HIP 24240 |
7.48 |
| 2026-02-18 00:00 |
05:12:23.57 |
-11:39:13.5 |
HIP 24240 |
9.12 |
| 2026-02-18 12:00 |
05:12:21.52 |
-11:37:23.3 |
HIP 24240 |
10.86 |
| 2026-02-19 00:00 |
05:12:19.58 |
-11:35:32.9 |
HIP 24240 |
12.65 |
| 2026-02-19 12:00 |
05:12:17.74 |
-11:33:42.2 |
HIP 24240 |
14.48 |
| 2026-02-20 00:00 |
05:12:16.01 |
-11:31:51.3 |
HIP 24240 |
16.32 |
| 2026-02-20 12:00 |
05:12:14.39 |
-11:30:00.1 |
HIP 24240 |
18.18 |
| 2026-02-21 00:00 |
05:12:12.87 |
-11:28:08.7 |
HIP 24240 |
20.05 |
| 2026-02-21 12:00 |
05:12:11.45 |
-11:26:17.1 |
HIP 24240 |
21.93 |
| 2026-02-22 00:00 |
05:12:10.15 |
-11:24:25.2 |
HIP 24240 |
23.81 |
| 2026-02-22 12:00 |
05:12:08.95 |
-11:22:33.2 |
HIP 24212 |
25.06 |
| 2026-02-23 00:00 |
05:12:07.85 |
-11:20:40.9 |
HIP 24212 |
23.17 |
| 2026-02-23 12:00 |
05:12:06.86 |
-11:18:48.5 |
HIP 24212 |
21.28 |
| 2026-02-24 00:00 |
05:12:05.98 |
-11:16:55.9 |
HIP 24212 |
19.39 |